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In MacOSX, using the standard, you can turn on mailbox threaded conversations, where all the mails for a conversation are collapsed into a single row and can be expanded. When using the mutt email client I configured a macro which allows me to tag several mails and then force them collapse into the same thread by setting the Message-ID header into all of them. Does such a plugin exist for MacOSX's mail application? Here's the mutt feature by Ulf Erikson.

Exactly what I'm trying to accomplish is select two random messages in my inbox (on IMAP server) and force them into a conversation. Also, select one and break it out of the conversation. I've been using this in mutt for ages in mailing lists, where sometimes people would reply to a thread changing the subject (there I would split the conversation thread). Or when I would receive several automated mails like "You bought this!", "We are billing you", "Here's the bill" collapse them into a conversation even though they are individual and come from different addresses without any filter rule-able pattern.

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Not exactly what I'm looking for, adding tags is not what I meant. The idea is to modify the mails themselves as if they had initially been in a conversation. This can be done on unix mailboxes modifying the headers, and it works on IMAP with any client. I've looked into Mail's elmx file format but it scares me to change the files out of Mail and messing the remote IMAP server. – Grzegorz Adam Hankiewicz Jun 25 '11 at 17:37
Combining somewhat related mail into a thread an interesting use case. – Daniel Beck Jun 25 '11 at 18:02
up vote 0 down vote accepted

Silly me, since I'm using IMAP folders I configured mutt on the server, run ssh into the mailbox and use the handy macros to modify the offending mails. The only drawback is that the macros actually work by deleting the old mail and creating new duplicates with the modified headers, and MacOSX's Mail re-parses them for filtering rules so I end up with duplicates in local archives. Still, I'm looking at a much more cleaner inbox now than previously.

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